JOURNAL OF THE JAPAN WELDING SOCIETY
Online ISSN : 1883-7204
Print ISSN : 0021-4787
ISSN-L : 0021-4787
Volume 27, Issue 7
Displaying 1-10 of 10 articles from this issue
  • [in Japanese]
    1958 Volume 27 Issue 7 Pages 369-374
    Published: July 25, 1958
    Released on J-STAGE: June 12, 2009
    JOURNAL FREE ACCESS
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  • I. Ukita, S. Nobuhara
    1958 Volume 27 Issue 7 Pages 375-380
    Published: July 25, 1958
    Released on J-STAGE: June 12, 2009
    JOURNAL FREE ACCESS
    We have investigated phenomena of the argon gas metal arc welding of aluminum by the high speed motion pictures.
    We have photographed the welding arc by the method similar to that of Dr. T. Okamoto and Dr. K. Ando, that is, we have photographed the welding arc as a shade, made by lightening of an intense carbon arc from the backside.
    In the clear pictures obtained, some effect of current density, wire speed, welding speed, and characteristics of the welder upon the phenomena are remarked.
    The results obtained are as follows:
    (1) The comparatively large particles and compararively small particles of molten metal transfer, one by one, from the wire tip to the base metal. Then particles more than one do not transfer at a time.
    The small particles are made in some circumstances at separation of the large particles from the molten parts of wire tip.
    (2) In the drooping characteristics of the welder, the size of particles is scarcely affected by current density in the region of our experiment. But in the rising characteristics, it tends to be smaller than in the droopng characteristics.
    (3) As a matter of course, the speed of growth of particles become large as the current density is large, and accordingly, times of the transference of particles increase.
    (4) Although the current density is large, there are scarcely the chance of short circuit and arc is peaceful when the gap between the wire tip and the base metal is long and the welding speed is proper.
    If the gap is short or the welding speed is too fast, arc, molten pool of the base metal and molten parts of the wire tip are agitated violently, and the spattering of small particles repeats frequently.
    In the rising characteristics, the agitation of arc, molten pool, molten parts seems to be stronger than in the drooping characteristics.
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  • 1958 Volume 27 Issue 7 Pages 380a
    Published: 1958
    Released on J-STAGE: June 12, 2009
    JOURNAL FREE ACCESS
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  • 1958 Volume 27 Issue 7 Pages 380b
    Published: 1958
    Released on J-STAGE: June 12, 2009
    JOURNAL FREE ACCESS
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  • S. Ohta
    1958 Volume 27 Issue 7 Pages 381-387
    Published: July 25, 1958
    Released on J-STAGE: December 10, 2009
    JOURNAL FREE ACCESS
    In tnis study, the author examines various calculating methods for the strength of inclined fillet joint; considers some of its characteristics, and tries to obtain the experimental formula and theoretical calculating formula of its strength.
    Seven kinds (α=0, 15, 30, 45, 60, 75, 90°) of double strapped inclined fillet joints (plate thickness 25mm, strap thickness 12mm, one weld length 80mm) are tested.
    1. Test results widely differ from the calculated results according to the old theoretical and experimental formula, and the ratio of strengths, end fillet to side fillet, is considerably high. And it does not seem to be true that the strength at α≅56°is minimum according to the projection method. But the strength is lower slightly at α=75°than at α=90°(side fillet).
    2. The calculated results according to the following convenient formula which is made by compromising projection method with Vandeperre's method approximate relatively well to the Vandeperre's test results:
    α≤tan-1R0 : R=0.3√R20cos2α+sin2α+0.7R0cosα
    α≥tan-1R0 : R=0.3√R20cos2α+sin2α+0.7cos(90°-α)
    where R=Ratio of strength of inclined fillet joint to side fillet joint.
    R0=Ratio of strength of end fillet joint to side fillet joint.
    α=The angle between the longitudinal direction of fillet and the perpendicular direction to the load.
    3. In both experiment and theory, the strength of inclined fillet joint seems to approximate generally to the strength of end fillet joint in the range of small angle α and to the strength of side fillet joint near the angle α=90°. But, as compared with the maximum shearing stress theory, the ratio of strength of end fillet joint and side fillet joint is high considerably, and it is likely that the minimum strength tends to happen at the angle α≤90°in the case of tensile load.
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  • Welding of One Kind of High Tensile Steel
    H. Sekiguchi, I. Masumoto
    1958 Volume 27 Issue 7 Pages 388-393
    Published: July 25, 1958
    Released on J-STAGE: June 12, 2009
    JOURNAL FREE ACCESS
    As already described in the report 6, if the dried gases are supplied and the dried conduits are used with the rustless filler wire, a weld containing a very small content of hydrogen is obtained by the C.S. arc welding process.
    And it was recognized in the previous research on welding of mild steels that this precess gives the weld showing a higher ductility and strength. Accordingly, it is deduced that this process will be suitable for welding a high tensile steel.
    In this report, the authors clarified experimentally the composition of the filler wire, which gives the weld with the same or a more excellent mechanical properties as the base metal of a high tensile steel, Welten 55.
    That is, from the results of the mechanical tests of the joints and all weld metals obtained by this welding process, it was deduced that a filler wire possessing the carbon equivalent of 0.65-0.7% is necessary for a square butt welding of a high tensile steel plate, 9 mm in thickness, and one possessing a much more a carbon equivalent is necessary for the multi-pass welding of the steel plates with the thickness of 22 mm. The addition of titanium in the filler wire seems to be effective also for the increase of strength of weld metal.
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  • On 52 and 56kg/mm2 High Tensile Steels
    H. Sekiguchi, M. Inagaki
    1958 Volume 27 Issue 7 Pages 394-400
    Published: July 25, 1958
    Released on J-STAGE: June 12, 2009
    JOURNAL FREE ACCESS
    Firstly the continuous cooling transformation diagrams, in case of maximum heating temperature 1350°C, and the continuous heating austenitization diagrams for two kinds of steel of which ultimate tensile strengths are 52 and 55 kg/mm2. And the following data (sec) were obtained:
    Cz' Cf' Cp' Ce' 50% MCT
    For 52 kg/mm2 steel, 1.7 3.2 8.6 460 5.8
    For 55 kg/mm2 steel, 1.7 3.9 25 520 5.5
    Then, summarizing the four transformation diagrams obtained in Report 1 and 2, the authors compared and discussed on the four critical cooling times, Cz', Cf', Cp' & Ce', and the 50% martensite cooling times of four kinds of steel in connection with the chemical analyses.
    It seems that the values of Cz', Cf' and Ce' increase with the silicon content of steel. And the values of Cp' and 50% martensite cooling time may be increased with the aluminium content of steel.
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  • Acetylene Generatar
    I. Ueda, Y. Imai, Z. Murakami
    1958 Volume 27 Issue 7 Pages 401-405
    Published: July 25, 1958
    Released on J-STAGE: December 10, 2009
    JOURNAL FREE ACCESS
    Although acetylene generators for used in welding and cutting are "Water to Carbide", "Carbide to Water", and Dipping" type, almost generators have been designed from the empirical data.
    We have introduced from many actual working shops that the requred pressure of accetylene at nozzle is 0.03-0.lkg per cm2 for manual welding (or cutting) and 0.3-0.5kg per cm2 for automatic. When we design the large capacity automatic acetylene generators
    (1) Average acetylene yield
    (2) Acetylene yielding rate
    (3) Water temperature
    (4) Quantities of carbide residue are necessary basic data.
    However, from the theoritical standpoint, the relationship between acetylene yielding rate and water temperature is most important.
    Authors settled the foundamental data for construction the acetylene generators by measuring the acetylene yielding rate and some. For the acetylene yielding rate measurement, for example, the second class carbide (JIS) 5kg. 7cm cubic lumps dipped at 20°C water temp., we can yield 4m3 acetylene per hr., and at 30°C, 5m3 per hr. We concluded also that 35-50°C generating water temp. is suitable from acetylene yielding rate, moisture quantity satulated by acetylene, solubility of acetylene, ammonia, hydrogen sulphide in water and supplied water temp.
    Still more, we found that the water quantities necessitate for lowering the water temp. are 10 literper lkg carbide. We can not use the homogenous quality carbide, but these data are useful for construction the large capacity stationary generators.
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  • S. Ando, N. Kimata, H. Doizaki
    1958 Volume 27 Issue 7 Pages 406-413
    Published: July 25, 1958
    Released on J-STAGE: June 12, 2009
    JOURNAL FREE ACCESS
    Several austenitic manganese steels differing in phosphorus content (0.024-0.085% and 0.276%) are welded with austenitic electrodes (Cr-Ni, Mn-Cr and Mn-Ni type), and mechanical test, slit type crack test and microscopic inspection on the weld zone are carried out.
    Under increased phosphorus content in parent metal, mechanical properties of weld zone are deteriorated and the hot-cracking tendency of weld metal and heat-affected zone is promoted. Phosphorus-rich, low-melting point eutectic in grain boundary is presumed to be responsible for these adverse phenomena.
    On the results of this investigation, authors deem it desirable from the standpoint of weldability to limit the maximum phosphorus content of austenitic manganese steel to 0.05%.
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  • Study of Rupture Mechanism in Brazed Joint with X-ray
    T. Yoshido, N. Nomura
    1958 Volume 27 Issue 7 Pages 414-417
    Published: July 25, 1958
    Released on J-STAGE: June 12, 2009
    JOURNAL FREE ACCESS
    In the previous paper it was shown that the strength of brazed joints depended on the method of the test, the dimension of the test piece and the joint clearance.
    The ground of this hypothesis was that the lateral stress in the rupture of brazed joint increased, as the plastic deformation of specimens concentrated on the part of the filler metal in proportion to narrowness of the joint clearance, and if rupture began in constant shearing stress, the longitudinal stress in the rupture became larger.
    In this paper further to confirm this hypothesis brazed specimens were broken with impact tester and the broadening of X-ray diffraction line of the broken surface was measured by using Geigerflex.
    The results showed that the plastic deformation of filler metal increased in proportion as the joint clearance was narrower.
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